Electric water pump

Abstract

Provided is an electric water pump which may have a reduced overall size by simplifying a power transfer structure between a power unit and a rotation unit, and effectively cool a stator and a rotor without any additional structure for their cooling by distributing a fluid between the power unit and the rotation unit.

1 . An electric water pump comprising:
 a motor housing including an inlet through which a fluid is introduced, and having an internal space;   a cover coupled to the motor housing, including an outlet through which the fluid is discharged, and having a distribution space communicating with the internal space of the motor housing;   a power unit positioned in the internal space of the motor housing; and   a rotation unit positioned to be rotatable by the power unit in the internal space of the motor housing, including an impeller positioned in the distribution space of the cover, allowing the fluid introduced through the inlet to pass therein for the fluid to be distributed from the inlet to the outlet as the impeller is rotated during its rotation, and being disposed to be spaced apart from the power unit to form a flow path, thereby distributing the fluid through the flow path.   
     
     
         2 . The pump of  claim 1 , wherein a support bracket on which a shaft is rotatably mounted is positioned in an internal space of the motor housing, and the impeller is coupled to the shaft. 
     
     
         3 . The pump of  claim 2 , wherein the cover includes a bushing part on which the shaft is rotatably seated. 
     
     
         4 . The pump of  claim 2 , wherein the impeller includes a rotating plate and a plurality of blades, and the shaft passes through and is coupled to a rotation center of the rotating plate. 
     
     
         5 . The pump of  claim 4 , wherein the each of the blades curvedly extends from the rotating plate, extends from an outer end of the rotating plate toward the rotation center of the rotating plate, and extends to a position spaced apart from the rotation center of the rotating plate. 
     
     
         6 . The pump of  claim 2 , wherein the support bracket has a through hole positioned around the shaft to distribute the fluid introduced through the inlet into the rotation unit, and the through hole has a support rib extending across the through hole. 
     
     
         7 . The pump of  claim 1 , wherein the power unit includes a stator and a molding part surrounding and sealing the stator, and the molding part is fixed to the internal space of the housing. 
     
     
         8 . The pump of  claim 7 , wherein the rotation unit includes a rotor part including a built-in magnet, and the impeller coupled to the rotor part and rotated together with the rotor part. 
     
     
         9 . The pump of  claim 8 , wherein the rotor part includes a rotating end having a cylindrical shape and including the built-in magnet to allow the fluid to be distributed therein, and a coupling end extending radially from a bottom of the rotating end and coupled with the impeller. 
     
     
         10 . The pump of  claim 8 , wherein the flow path is formed between the molding part of the power unit and the rotor part of the rotation unit to allow the fluid to be distributed, and the internal space of the motor housing and the distribution space of the cover communicate with each other by the flow path.